GameObject.layer

Description

The layer the GameObject is in.

You can use Layers for selective rendering from cameras or to ignore Raycasts. Unity generates 32 layers, labelled with integers from 0 to 31 and reserves layers 0 to 5 for its own systems. You can use layers 5 and above. To add or view a layer, click the Layout button in the top-right of the Editor window.

// Put the GameObject in the ignore raycast layer (2)

using UnityEngine;

[ExecuteInEditMode]
public class ExampleClass : MonoBehaviour
{
    void Awake()
    {
        //gameObject.layer uses only integers, but we can turn a layer name into a layer integer using LayerMask.NameToLayer()
        int LayerIgnoreRaycast = LayerMask.NameToLayer("Ignore Raycast");
        gameObject.layer = LayerIgnoreRaycast;
        Debug.Log("Current layer: " + gameObject.layer);
    }
}